Anatomy

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What are the functions of the Respiratory System?

1. Provides for gas exchange- intake of O2 for delivery to body cells and removal of CO2 produced by body cells

2. Helps regulate blood pH

3. Contains receptors for the sense of smell; filters, warms, and moistens inspired are; produces sounds; and excretes some water and heat

Trace the path of an O2 molecule through the respiratory tract.

O2 comes into the body either through the nares then through the nasal cavity or through the mouth then through the oral cavity. Then both ways continue down the pharynx, then through the larynx , then through the trachea then through the bronchial tree (bronchi to bronchioles) then through the alveoli into the circulatory system.

What are the two external openings on the outside of the nose called?

External Nares

What are the two internal openings within the nose that connects the nose to the throat?

Internal Nares

What are the functions of the Nasal Cavity?

1. Filtering, warming, and moistening incoming air

2. Detecting olfactory (smell) stimuli

3. Modifying the vibrations of speech sounds

Where is the Pharynx located?

Starts at the internal nares and extends halfway down the neck; Also known as the throat.

What are the functions of the Pharynx?

1. Passage way for air and food

2. Resonating chamber for speech sounds

3. Houses the tonsils

What are the functions of the Epiglottis?

Piece of cartilage that prevents food or liquid from entering the larynx during swallowing